Total Electron Count and GPS/GNSS Range Error Realtime

Above: Global Total Electron Count Map

Above: Global TEC and L1 range error

Above: European TEC. Scale shows TEC/Range error



Above: North America TEC and Range Error


Above: Asia/Pacific TEC

What are these?

Affected by solar activity, Total Electron Content (TEC) describes the total number of free electrons present within one square meter between two points (i.e. between the receiver and satellite). The larger the TEC quantity, the longer the delay in a received GNSS signal. This leads to positional errors in GPS readings amounting to tens or even hundreds of meters in severe circumstances.

The maps above shows the latest TEC values, updated every five minutes.

Credits: as shown on the images.
Click on the images to open source websites.

The G7IZU Radio Reflection Detection page. A website featuring articles about space weather, aurora, and things related to the ionosphere